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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.windows__object_handle.async_wait"></a><a class="link" href="async_wait.html" title="windows::object_handle::async_wait">windows::object_handle::async_wait</a>
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<p>
          <a class="indexterm" name="asio.indexterm.windows__object_handle.async_wait"></a> 
Start
          an asynchronous wait on the object handle.
        </p>
<pre class="programlisting">template&lt;
    typename <a class="link" href="../WaitHandler.html" title="Wait handler requirements">WaitHandler</a>&gt;
<a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_wait(
    WaitHandler &amp;&amp; handler);
</pre>
<p>
          This function is be used to initiate an asynchronous wait against the object
          handle. It always returns immediately.
        </p>
<h6>
<a name="asio.reference.windows__object_handle.async_wait.h0"></a>
          <span><a name="asio.reference.windows__object_handle.async_wait.parameters"></a></span><a class="link" href="async_wait.html#asio.reference.windows__object_handle.async_wait.parameters">Parameters</a>
        </h6>
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<p class="title"><b></b></p>
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<dt><span class="term">handler</span></dt>
<dd>
<p>
                The handler to be called when the object handle is set to the signalled
                state. Copies will be made of the handler as required. The function
                signature of the handler must be:
</p>
<pre class="programlisting">void handler(
  const asio::error_code&amp; error // Result of operation.
);
</pre>
<p>
                Regardless of whether the asynchronous operation completes immediately
                or not, the handler will not be invoked from within this function.
                Invocation of the handler will be performed in a manner equivalent
                to using <code class="computeroutput">asio::io_context::post()</code>.
              </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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